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《Journal of Chemical Industry and Engineering(China)》 2005-01
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Application of improved BP neural network in identification of air-water two-phase flow patterns

ZHOU Yunlong1,SUN Bin2,LU Jun1 (1Northeast China Institute of Electric Power Engineering,Jilin 132012,Jilin,China; 2North China Institute of Electric Power Engineering,Baoding 071003, Hebei,China)  
The pressure difference fluctuation signals of the air-water two-phase flow in a horizontal pipe were analyzed by statistical and fractal theory.Seven parameters, i.e. the averaged value of the pressure difference, standard deviation, skewness,energy ratio, box dimension,correlation dimension and Hurst index were obtained and be used as the characteristic vector of an improved BP neural network with self-adapted learning ratio. Learning form training samples, the network could accomplish the objective identification of the unknown flow patterns.The simulated results showed that the flow pattern characteristic vector which was obtained by statistical and fractal parameters could reflect the difference between various flow patterns and the recognition possibility of the network could reached up to about 93 percent.Moreover, the improved BP neural network had the merits of fast convergence for simulation and avoidance of local minimum.
【CateGory Index】: O359.1
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